Multiple Exposures to Ascaris suum Induce Tissue Injury and Mixed Th2/Th17 Immune Response in Mice

作者：Nogueira Denise Silva; Gazzinelli Guimaraes Pedro Henrique; Barbosa Fernando Sergio; Resende Nathalia Maria; Silva Caroline Cavalcanti; de Oliveira Luciana Maria; Oliveira Amorim Chiara Cassia; Silva Oliveira Fabricio Marcus; Mattos Matheus Silverio; Kraemer Lucas Rocha; Caliari Marcelo Vidigal; Gaze Soraya; Bueno Lilian Lacerda; Russo Remo Castro; Fujiwara Ricardo Toshio^*

来源：PLoS Neglected Tropical Diseases, 2016, 10(1): e0004382.

DOI：10.1371/journal.pntd.0004382

Ascaris spp. infection affects 800 million people worldwide, and half of the world population is currently at risk of infection. Recurrent reinfection in humans is mostly due to the simplicity of the parasite life cycle, but the impact of multiple exposures to the biology of the infection and the consequences to the host's homeostasis are poorly understood. In this context, single and multiple exposures in mice were performed in order to characterize the parasitological, histopathological, tissue functional and immunological aspects of experimental larval ascariasis. The most important findings revealed that reinfected mice presented a significant reduction of parasite burden in the lung and an increase in the cellularity in the bronchoalveolar lavage (BAL) associated with a robust granulocytic pulmonary inflammation, leading to a severe impairment of respiratory function. Moreover, the multiple exposures to Ascaris elicited an increased number of circulating inflammatory cells as well as production of higher levels of systemic cytokines, mainly IL-4, IL-5, IL-6, IL-10, IL-17A and TNF-alpha when compared to single-infected animals. Taken together, our results suggest the intense pulmonary inflammation associated with a polarized systemic Th2/Th17 immune response are crucial to control larval migration after multiple exposures to Ascaris.

• 出版日期2016-1